The relation neither reflexive nor irreflexive. It is symmetric. But I do not understand why it is not transitive.
2026-04-02 11:37:57.1775129877
Why is this not transitive R = {(1,1),(1,3),(2,2),(3,1)}?
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Well, $3$ is related to $1$, and $1$ is related to $3$ - but is $3$ related to $3$?